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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dfefc1e20f8baaec244830761c3c541e29513a2e1a0be6222cebf9e7c52fd9c' 
  AND token = '1k18wDcjomhscxs1rMdleelKZn5QQ+vPE0DCqnmrtKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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