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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7002626a18434845f34bb2dacfca45f246ec8f2c89626b2e32ec456c2afd02' 
  AND token = 'zMNrSpuF3bWlZBuzgsgUCyre88Li3CpS3M2evvie+KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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