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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c99bc4b5b34d9edfdc9d47b9eb176771de63e08e1757eec2b769ee6b1d79b4e9' 
  AND token = 'aVNGLhN24p9WJtDSY6bhHMcslKvK7VuR4W5/qCwFzaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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