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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6723b8bcc33e0d0902ffbaea0e28f363ae875185cf960cdf4731339b05201a4a' 
  AND token = 'Ynn+pusFftDVfQWCpAwcqjdZomA0m/aiV/C1t52F38s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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