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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983dd088a78a36b2f4e7d3745fb1fd6d8b77f36853e330eb8e5f151b8094b12c' 
  AND token = 'zlnug2jskdCtvgrh6YqmibPX0OIz9kHIddzfNu5S8mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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