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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17ba45b3e8830a18ea05178519c5fe2495aca2e0ec4ffea99253dd188173e8a1' 
  AND token = '7f6Pww/HEO6Dj1BgENRTxQowYnt767mUS3WjAJh3+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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