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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f5f3379aae989fc2001cc7907f33154b8df9410be17a360a389082a02b76d9f' 
  AND token = '/N+4jMZdBdd0nhqa9BdUgRoZGOZKaOtAdCyjD9gMP2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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