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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94937ffe374181624e2784aa758e392d674e9f3a9cdba601c256eb624ffc10c' 
  AND token = '+Svgmz4IKVcgEcZbVrSvyAXBHmRkf6i303z7VNcto9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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