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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '777d4a4b2a58fe8618b904ace796c60ba6659de6681ced13978ce97889fc5d46' 
  AND token = 'nzkdIQ2080vqukfi/yCYW77+0EgkkhB9JgHO7gfyBgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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