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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f3cb66eab3b9953ec637340c0d9250310003f422943d3d2db37826da9d55bb4' 
  AND token = 'yiFg9P1yyaZWgIoZsLQUQ/Ej6beJj5FdIiLUfNVNPoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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