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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '710fac40577ff688d9983ff08ac4cfcdebf8891c4e543a0f793d5f6a833999e8' 
  AND token = 'tYorTgrFpcejB65qv0vzbpXor++vIDKD5EgvHUTmDVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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