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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59f44cd10227fa2252ad88f2b9f7e6d3f6ff1a14165059290e947a11ec2abc1f' 
  AND token = 'BfVFka2i+9eNGnak51oufvxfkRNRuBjJnaJUsRc/Mtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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