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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eba3f59d6c3cae60dbb121dcb27e3924a3890035b4d1b469e7721dbb19b5c34' 
  AND token = '6p3MkiCoA8d6DqlvovqPiDFSFxvOG63Yf6l1+PWuF7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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