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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e66bfa8037e69c52f82f1e910dbf1d51d63141cb431246631c03642de5f505d' 
  AND token = 'OsgZ4NjXeO+ZU464W+XLrs1WPCwngRN1+570yJISk7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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