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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd4ad698cf13ad4c5ebbd183eb1cec9da170e546c8f101bed31d20d985f8aba4' 
  AND token = 'egLPM8Om2+vIP0oIZ8AXMQYz9DAg5HpytVIRC2uSHdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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