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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0540a7f1ffbfa3fc0db59ec7cf13b1f476f94b3d6d9a09834395df2ee815946' 
  AND token = 'pbMv2hk7mIEVJf7R4hnpW6soZC5Q8PAFIQvghuudZWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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