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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf656eaec0d36008c33ea4ca7cc627ee7282aeaa37671e80c9470eac4e73e708' 
  AND token = '256A2wzb3YDs50n3Ut3junOShCLUVYBh+7rhJ8qQ6js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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