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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5090394551330f219bbc58d75564722e5561d4ea6402178f05cb14c4053be6c2' 
  AND token = '+kCOMmRpCdqgSaYIOdE6Hn3phps1mYeeEkP382oT7Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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