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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96b3e337345cdd6c1c08592c22feffb2de63984434dccc1d2e55f12b6cba9053' 
  AND token = 'kodsALs4g4oAFlHuBAY9Os0TPezI+wpEc5NOUUehGi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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