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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6ad640f14826dde7a2c308a54e532a65fa7c6a87966bd5dcce4efd8a2de9c5f' 
  AND token = 'Q4qf/xP7rOe/2YLWWuF/u2qfXoWRCZypBhHqGLX69Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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