SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6bcc0ecc8b1f06580dd323ca457bc536c481d0902fba7a8ff7582f4fdd51557' 
  AND token = '3Tq+dL4DnTwyMDB019ivYJKUTjbPjWVsI38Bwq6GRXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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