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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e611d2fb32c033d3813e3bf4bcb8e4d853ac3e7bf7ae92ca499c80e998d79fcc' 
  AND token = 'GjObEq6wQaZVx7dBTqFJtOcImBRfskfnmv1u9I4OfNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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