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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'badfd7e3d90bc3e1ba2b527b2ef130c604079a72c8a70062c678c083590a0f8a' 
  AND token = 'vaCWJGCWLqYoV1tQrkxAppR9v/2LINN7eyCUIMoTQOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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