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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ba2e968ffaeca11b4b33d88dafcdac2723f193520b0ffc6a125afbde7ae6151' 
  AND token = 'j0FImRkTkbjSx+dRGW/ktCwjQDIsmj6b/+20t1NJA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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