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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5c3055e3a998f259930424bdd0d53432ec8a969d8d4893fc2d1c34ae5c6c5e0' 
  AND token = 'y4Fevxik4n2K/yWKZOYtrqgfoDO0E48elXMXVxpwyVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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