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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9706c250475e921af93803e1aee88aa6e0a7096b2029e62f7ae8eec0d103f3aa' 
  AND token = '+oxLLvk+P5vKWbJ4J/3FFvA+Ghhlo1dQ/KqHrsQH5IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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