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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c150003bb8b137c7c7a29b664feecf99568d487bb1ad619c806514cd7bef5084' 
  AND token = 'z97O9qCCU5nSb4yfBeDqym67wV4olFwPRt4IUZPteQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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