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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc29e0850383bc09a618c4b4874ce474ef39dc2feabb4751121b16c71ed6b957' 
  AND token = 'd0HZyFZtLdYG6m242u9JQpy4ysoNJ3vbTmfWtzOxirQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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