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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1762e45af9bb4e9ce314362dd8e617b6662f6a2d1776aa52038dcc3a2bbc9d6' 
  AND token = 'nh6nbxmTAlAC5wKIcmz2XfZEclL7ZrGxRUte6B6vrr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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