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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86e80af57361bb89ad8bb8b7f7744803f105a93aadbe97f741e57af2e2543ccc' 
  AND token = 'c94/6H9uWj56dLZMrQYEPncyQrfAv/ITYnSTC1+RuiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}