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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de489aee98c471cc9900eb55c7b8a2ed95899196c8bf93952e4c6eb1acbae7d' 
  AND token = 'W8BZQ3A1sRzKkOqu6ASnqX4G2S+Dh5gSNyWijdEF7Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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