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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c68c165d2f5e3cbf024553aeba9a2655903658dcc082bdd7da3eee6dbe4d65f' 
  AND token = '65Z6d3NkEfgugUX3FTYYEclYKSxk/nc177QsKXMpz70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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