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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c3d29972f212ed0ec40a0c63329320543168d90b549c56e15213ccfa3795f5' 
  AND token = 'l3L30AGNujpWL433TZV9SoVRSmtkGTzmA70D9nuunuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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