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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '217a7827870eb69b677a2500c26fd066cfd0a228531e47eb751842c828002bd8' 
  AND token = 'R4KpUeFt4aj7KrDfOrw+ANpyrHqlam6w51IRQLA+I5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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