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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0606ed24b2f0da2572caa7a2d2319d95860d04df53aeb0ffbf9aa54c499b5bb6' 
  AND token = 'zBGUMAb5Z6cY511gwwWavsasYf3ntgDwU7BnsbKqxGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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