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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '470834d3e5200447a3565d2eed6a78cc85235fff5791d1b77a13c59625edcf37' 
  AND token = 'SxEa1YyeCM0vhrzxyS4flzN0GsyzOWiYtSMrAB9Pp8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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