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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79dec38e04b1382632dca405d73590a69c8f5ed2e6858fe656217b7b99a41896' 
  AND token = 'G4XJsVmc6Toi3LP8iWjkmi1uqKMm827jx7cTe8Enmdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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