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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da1d51cd74bf64307e8a7936fca8b4feb3570ab654c4598d4f713e7b4fd03a8f' 
  AND token = 'NzP700PDEUkRmgHDDFgCBtuewz4ECZw7GG7TLD/W1AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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