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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f5d54f3b9481cf6b04e4952ac5c7877b9dc99e9db7716ea515873e2c79d7c5b' 
  AND token = '4vXUjnAg8dSyx3ZQ8DDNxrc0y8lAprFmDVNj/m8JSCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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