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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cc6e115358139fd227e1899ad4fcac72ab0c3e5084ea8befe0a561ccf8b86e3' 
  AND token = 'YI1q80Qjdiarl3f9keJL8uWeo77GfCotoUcWU9y0BEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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