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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea757e660c8f1e5fd99bf5d9a96fcf0012c2a5fa46d2ff001dd2b49ad3e380fb' 
  AND token = '3P4CKG0a5vc/8MzqXOdBRgYFgv9er6OEatWwUbbM18U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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