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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ea4260c5c3a28e6edb40194a4af5ba572f968ca1863c9621d96a081edb9f9b' 
  AND token = 'K86Q6l3B8dbK17ebKtSjSg6yEWN7lT2gUhINNvL3Mjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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