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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f7a8357d7cb5e2f9211eab31de638adae591f39cd8662af4ad33d604a60f474' 
  AND token = 'zfwZmsjOXuZNVoyiQFj09mlPrh0Kfo3Y9dXwatsN5QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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