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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba721d6b0252f23c4749d57bf949e4d229b8f0dcb7898d0aa2a94be24ce0211e' 
  AND token = 'u6MtVSkGtROyj0tTLyh6vXLt3GMNMA8CDTjm2S4tUPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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