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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8f0e0be7805f7d97e2249cd32a391d9985594d4dee78149529f8a51deb355f7' 
  AND token = '2ku8OgKri9gJ29vqhFiRDdXmrUKuNExQOzuxMAXcDQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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