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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b609691820d2b614a8fe75975956db5e2d50634602b774c9864ef7fe7f24575e' 
  AND token = 'q8bztjWvpoiRk9AJ2Jd/CyQl0EQ7+qydTcmEjqeLRvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00168

JSON explain

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