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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62018c8f43cae5196c1ab1fc57d99768a9b23a0870a1576b66e9f1a9d6f6874d' 
  AND token = 'KB9wWDQirvkTBSJMMSCr7mQkbNF8J3mVBKg0ufDymtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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