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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55f0ed1ef34a451e29fc052de1c15fd4ba51c6fc4c7ca953d3535b927118f67' 
  AND token = 'sMveRDoqI5syFysLhq3ZbalLcPY66PwLiyrEYPxOQ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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