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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '400706b9c0a919ccd500b7b4e100c3efefc3693365e63282ca66bc332b8e1a70' 
  AND token = 'jSoZIDSdihfS1rw2wl0xrriAf9LfNU7CEQGonwtJ8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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