SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d580239ff64b534460171111942c4d6bc96a38572e26da7178f7248a0f5cee' 
  AND token = 'nJZR3ZCg7J8ZvEcMMOZPPkLVQYofR1U+lH3wZbd5FuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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