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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96712fa7e4d6512659e5d61e3f805d4ed0612022256136cbcfee50b19ec8f704' 
  AND token = '2lheHnpEE7IHXmjyUNJUVtnaN2944ST0+vYGOtyEsmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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