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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67badfeda0b4d7e48fe29896fcf0a1e992dcd79896433f70f624c5cc25024261' 
  AND token = 'jHfffdqyo6nR6AjDXTTmXJaN2Rz64fRb3V6nPme37cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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