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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a07e8674192e11a8dee86c55e53f9e2cc54b2a575a0330b43e260cbec50b9177' 
  AND token = 'SF3CZvKDK03d+ZLu+cQoon0PfevC9Yiwd9o6muG8O5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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