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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdcc4d9b1b10fd4f3430cad08e98d51815037befc60b9074ea1fd9f03656a60a' 
  AND token = 'StjNOsib8LhLQQpk4K5QgHZPw2YQGTikWyhmxPTh9uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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