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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c629368e6556d45d71fe0562cbcef50f09bbd00d88d7d25b181fa8853aaf937b' 
  AND token = 'qu4w1Z11dQr4a2Bpa7YK/k8LpWndJsKa03z9ntulk+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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