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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45213c3d11bcf247c97c6ed102af62ed3e3d933b694cca3ca1fc8aacaa949284' 
  AND token = 'ONO1g2wGcE3Q4YtHWnBM6ccaazEZD0+vvMOXu/iXbaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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