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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16614a093934656cfde0279a11a644b23064cd7226e6f6a922e482d12a4985dd' 
  AND token = 'IH8Rt2J2PqIGmuVgK4Fbhie5w2I62QSGKcaaKmUB8RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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