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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66df6134ffdadb024db063e50f1f5007c70fe3e87d031c317daa733f5ad4c500' 
  AND token = 'ypyNf3Qfol2kZlTSwnXsy0m9XYY3BLiStcGxueWi6Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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