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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28480917ac7e5cd84b12ec36e531a1ec47c855fe3849e893e1002c0940c2459e' 
  AND token = 'iNEKfSkf/k9Y3FkinXnGWJ0694041EB7r+ZL21cNSQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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