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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0a434f4c454b0a14f96bb4a9fc0fa7212cf54314f3ebcf1a7cbe52ab614f700' 
  AND token = 'RY/8VSSS4Q980z3kC14GAaiKtyzU8AJyJwCFbFN1dzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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