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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f331f52f6121675ac3910635235f990a8af61a8d77c9baaa215de7b7e7551c26' 
  AND token = 'rMwjBM3DAt0frqQP9gkQu9fbocAaJ268sPL8Yz5t5HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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